86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package log
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import (
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"fmt"
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"os"
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"runtime"
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"strings"
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"time"
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)
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// GoogleEmitter is a wrapper that emits logs in a format compatible with
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// package github.com/golang/glog.
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type GoogleEmitter struct {
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*Writer
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}
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// pid is used for the threadid component of the header.
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var pid = os.Getpid()
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// Emit emits the message, google-style.
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//
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// Log lines have this form:
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// Lmmdd hh:mm:ss.uuuuuu threadid file:line] msg...
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//
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// where the fields are defined as follows:
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// L A single character, representing the log level (eg 'I' for INFO)
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// mm The month (zero padded; ie May is '05')
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// dd The day (zero padded)
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// hh:mm:ss.uuuuuu Time in hours, minutes and fractional seconds
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// threadid The space-padded thread ID as returned by GetTID()
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// file The file name
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// line The line number
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// msg The user-supplied message
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//
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func (g GoogleEmitter) Emit(depth int, level Level, timestamp time.Time, format string, args ...interface{}) {
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// Log level.
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prefix := byte('?')
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switch level {
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case Debug:
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prefix = byte('D')
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case Info:
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prefix = byte('I')
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case Warning:
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prefix = byte('W')
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}
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// Timestamp.
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_, month, day := timestamp.Date()
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hour, minute, second := timestamp.Clock()
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microsecond := int(timestamp.Nanosecond() / 1000)
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// 0 = this frame.
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_, file, line, ok := runtime.Caller(depth + 1)
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if ok {
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// Trim any directory path from the file.
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slash := strings.LastIndexByte(file, byte('/'))
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if slash >= 0 {
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file = file[slash+1:]
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}
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} else {
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// We don't have a filename.
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file = "???"
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line = 0
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}
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// Generate the message.
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message := fmt.Sprintf(format, args...)
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// Emit the formatted result.
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fmt.Fprintf(g.Writer, "%c%02d%02d %02d:%02d:%02d.%06d % 7d %s:%d] %s\n", prefix, int(month), day, hour, minute, second, microsecond, pid, file, line, message)
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}
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